Doc: tools: cibadmin incorrect example for score update

Should use --score.

Also change formatting of --score option documentation. It appeared
correctly in help output, but the man page generation yielded ugly
indentation.

The new formatting looks worse (but passable) for --help output and
looks better (previously unpassable) for man page.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>